Effect of Dual Template Synthesis Conditions on Structural/Sorption Properties and Acidity of Microporous/Mesoporous ZSM-5/MCM-41 Aluminosilicates

Barakov, Roman; Shcherban, Nataliya D.; Yaremov, P. S.; Solomakha, V. M.; Gryn, Svitlana; Khaynakova, Olena; Ilyin, Vladimir G.

doi:10.1007/s11237-013-9325-7

Cited by 4 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using of bifunctional polyammonium surfactants «Gemini-type surfactants» as structure directing agents (templates) with two or more quaternary nitrogen atoms (promoting the zeolite formation) connected with C 3 -C 6 alkyl bridges, as well as with one or two terminal hydrophobic (C 16 -C 22 ) alkyl groups limiting the growth of zeolite crystals and forming a mesostructure is one of the most promising and original approaches for obtaining of micro-mesoporous materials of zeolite type [9,10]. Using this method the analogues of a number of known zeolites (MFI, BEA, MOR, FAU and others) with so-called hierarchical porosity, different morphology (nanoparticles [11], nanolayers [9], nanorods [12]), structural and sorption characteristics inherent to zeolites and mesoporous molecular sieves (MMS), in particular-significant predominance of relatively large mesopores with diameter of 5-15 nm [11,13] and high (up to 0.6) accessibility index of acid sites for large molecules of organic substances [11,14] were obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid micro-mesoporous materials based on precursors of ZSM-5, ZSM-11, b, Y, mordenite, and others zeolites [20][21][22][23] containing zeolite secondary building units in a framework walls [6,24], and composite ones containing the phases of zeolite and MMS [25,26] were obtained. At the same time the search and optimization of the conditions for the formation of such materials remain topical.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

et al. 2016

View full text Add to dashboard Cite

Carrying out the dual template synthesis (in the presence of molecular and micellar templates) in the alkali metal-free reaction media (pH 11.7-12) at a relatively lowtemperature hydrothermal treatment (100-120°C, duration 3-5 days) allowed to obtain micro-mesoporous aluminosilicates combining the properties of zeolite ZSM-5 and mesoporous molecular sieve AlSi-MCM-41. X-ray amorphous sol-precursors of ZSM-5 zeolite obtained by preliminary hydrothermal treatment of alkali metal-free reaction mixture at 160°C and containing secondary building units of zeolite were used as initial substances for synthesis of micro-mesoporous aluminosilicates. During the joint formation of the structure of zeolite and mesoporous molecular sieve in one reaction mixture and in contiguous conditions close to optimal for their individual formation, composites zeolite/mesoporous molecular sieve were formed. The structural and sorption characteristics and acidity of the obtained composites differ from mechanical mixture of two phases. X-ray amorphous micro-mesoporous aluminosilicate with secondary building units and precursors of ZSM-5 in mesostructure is characterized by higher concentration and strength of Brønsted and Lewis acid sites as well as a higher catalytic activity in the reaction of cracking of cumene compared to AlSi-MCM-41 of similar composition. This aluminosilicate also exhibits a higher total selectivity toward the major products of reaction, in comparison with ZSM-5.Keywords Micro-mesoporous aluminosilicates Á Dual template alkali metal-free synthesis Á Zeolite ZSM-5 precursors Á The degree of zeolitization Á Structure and sorption properties Á Acidity Á Catalytic cracking of cumene

show abstract